Motor pump with sand trap and piming means



J. B. WADE MOTOR PUMP WITH SAND TRAP AND Hmmm MEANS Filed Feb. 25, 1946 March i, 1949.

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Patented Mar. l, 1949 MOTOR PUMP WITH SAND TRAP AND PRILIING MEAN -Jolm a. wade, Arcadia, caux., minor to Food Machinery and Chemical Corporation, San Jose, Calif., a corporation of Delaware Application February 25, 1946, Serial No. 650,002

5 Claims. (Cl. ID3-118) This invention relates to pumps and particularly to pumps of the Moineau type which are dis- ;:ovsed in U. S. Patents Nos. 1,892,217 and 2,028,-

It is an important object of this invention to provide a Moineau type of pump which is self priming.

Another object of the invention is to provide such a pump in which the priming automatically starts immediately upon the pump being placed in motion.

Yet another object is to provide such a pump which is rendered self priming for a relatively long period of time by a relatively small amount of water.

A further object of the invention is to provide a relatively compact motor pump unit embodying such a self priming pump.

The manner of accomplishing the foregoing objects, as well as further objects and advantages, will be made manifest in the following description taken in connection with the accompanying drawing which comprises a diagrammatic vertical sectional view of a preferred embodiment of the invention.

Referring specically to the drawing. the motor pump unit I illustrated therein includes a pump I I and a motor I2.

The pump Il has a main casting I 3 in which are integrally cast a pedestal-like base I4, a pump casing I5, and an intake valve unit I5.

'I'he base Il has a central boss I1 in which is formed a vertical threaded hole I8. The hole I8 communicates with an intake water passage I9 having a lower wall 20, in which a tapped drain opening 2I is formed concentric with the hole I8, this opening normally closed by a plug 22.

A sand trap 23 is provided by the space in the bottom of the casing I between this and the central boss I1. Access to this as for cleaning or draining purposes is provided by a plug 2l.

The intake valve unit I6 includes a screening chamber 25 having a top wall 26 and an outer wall 21. Enclosed between the wall 25 and an upper wall 28 is a valve chamber 25. Formed concentrically on a vertical axis in the walls 25 and 25 are threaded openings-5l and 5I.

Screwed downwardly into the threaded open- 2 downwardly with a closed cylindrical screen 35 suspended thereon. Resting on the valve seat 35 is a valve 40. This has a guide spider 4I extending downwardly into the seat I5. Rising from the valve 40 is a guide stem 42. Screwed downwardly into the threaded opening 2| and closing the valve chamber 25 from above is a cap 43 having a central hole in which the stem 42 is received and slideably guided when the valve III ismoved towards or away from the valve seat 35.

Normally closing a tapped drain hole in the wall 21 is a plug 5I. This wall is also provided with a tapped hole 52 into which an intake water pipe 53 is screwed.

The pump casing I5 has a tapped hole 5l, normally sealed by plug 55. and a tapped hole 55 for receiving a discharge pipe 51.

Screwed into the threaded hole I8 of the base I4 isa Moineau pump stator 50. This stator includes ametal shell 5I having a soft rubber liner l2 formed therein and bonded to the shell 6i. The liner 52 is provided with a double threaded chamber B3 such as is characteristic of the Moineautype pump.

Formed in the outer surface of the stator shell 5I close to the lower intake end thereof is a shallow annular recess 55. Formed in the shell 5I within the recess 55. is a hole 55 into which is driven a bushing 51 having a relatively small orifice 55. The bushing 51 is preferably of stainless steel or of some similar corrosion resistant material.

Formed in the rubber stator lining 62 co-axially with the orifice 65 is a hole 10 which is preferably much larger than the orifice 58. Surrounding the stator 59 and ilttlng tight thereagainst while overlapping the edges of the recess 55. so as to control access of water to the orifice 55, is a ne mesh screen band 15.

Rotatably disposed in the stator chamber 53 is a Moineau pump rotor 15 which is preferably formed with a sheet metal wall 'Il which has been pressed into the proper conguration with a single pitched thread suitable tor cooperating with the double threaded stator opening 5l to pump water upwardly through said stator chamber when rotated therein. The lower end of the metal wall ing 25 is a valve seat l5 which communicates 50 11 hasaninternally threaded head 15 into which on the coupling head 80. The coupling 8I also;

has an upper head 84 with a socket 85, in which the upper end of the cable 82 is secured, and a receptacle 88 into which the lower end of a shaft 81 of the motor I2 is secrewed. Coupling 8| has a rubber Jacket J vulcanized thereon to protect it against corrosion. i

Included in this motor is a motor base 88 which lines and sucking water up to the intake end of the pump.

It should also be noted that the admission o! the priming iiuid to the stator chamber .through a very small orice accomplishes several important purposes. By producing a spray of water in suspension in the pockets 96. the entire pump is water lubricated with the rst few revolutions of the rotor.

rests on andis secured to the upper endV of the pump casing I5. The motor base 88 is provided with a liquid tight seal 90 to prevent the escape of oil fromI the motor I2 downwardly into the pump II and to likewise keep Iwater from getting into the motor.

Operation uses, one of which is pumping water froxnshallow wells in which the pipe53 connects through any elbow with. a vertical pipeextending downv'vardly-v into the well. When the pump is fir stinstall,ed,.

The motor pump unit I8 is adapted for many 20 it is of course dry. After being connected'to the well therefore, the plug 55 is temporarilyremoved -16 mounted thereon. While rotating clockwise, the rotor 16 revolves counterclockwise ecce'ntri v cally about theA axis ofl the' stator chamber in the manner typical withthe Moin'eau pump.

This produces a series-'of closed pockets- 9,8 benow energized sov as to rapidly j tion ofta pedestal-likefbaseya skirt-like pump,

'I'he small size oi orice 88 also permits the pump unit I0 to be operated for several minutes and thus suck air from a relatively long intake pipe 53 without exhausting the priming iluid.

Another advantage of this orifice being small is that-it does not interfere to an appreciableA lextent' with the capacity of the pump even though it isin fact a by-pass between the pressure and suction sides of the pump.

When the pump is stopped. water collects and remains in the intake passage I9 until the pump is started agaim. This water primes the pump for -ashort timebut if the'pipe 58 has filled with air` -fwhich must be ,sucked out again, priming from the orifice `68 is required before water arrives through the pipe 53 at the intake end of the pump.- Iclaim: f f

1. In a water motor-pump unit, the combina-k casing'extendingupwardly from the periphery. of said "bas'e;f a 'motor mounted on top of and closing "said' `casing. the shaft of -sid motor extending'vertically vdownward into said casing; al

` stator mountedin said base and extending upward tween the rotor 'I6 and the stator which. travelv 40 longitudinally of the rotor V'a rid"{i n' ,the present case upwardly 'so 'as to pump uid from'th intake, passage I9 into the' upper* endjofpthe priming'.

chamber'li5.` I l Whenthe pump is rstfstarted, the ypassage I9 and pipe 53are lled with air and this air must 'y be pumped therefrom and 'a suction created to draw water upwardly to the pump. In order for this to be done, it is necessarythatthe'pump 68 be primed. In the present inventionfthis isa'ccomplished by water being sucked through the orice 68 from the primingchamber95 and delivered in the form of a spray. into the pockets coaxially withsaid shaft, said stator having a rubber-lined female threadedchamber, there being an inlet passage formed in'said base and connecting to'the lower end of'said chamber, the `uppery endl ofsaid chamberopening into said `casing;;' an outlet pipe leading from an upper portion ofv said casing; a male threaded rotor rel xvolvablyJ-'disposed in said ychamber and always 'incontact' therewith in any cross section, the y `number' of female; threads of said stator exceedingby one unit the corresponding number of male threads on the rotor; a flexible kcoupling connect.- ingsaidmshaft with said rotor, ,rotation of the latter causing 'a ,series of closed pockets to be formed between said stator and said rotor and pension andtravels upwardly withthe pockets S6 so that practically immediately from the starting of the rotation of the pump rotor 'I6 the engaging surfaces of' the rotor and stator are moistened suiciently to make a good air-tight t between these and to lubricate these surfaces so that the motor Bernay. turn the rotor at maximum speed, thus speeding up the Withdrawal of air from the passageways leadingvto the well and 'I the delivery of water at the intake end of the pump.

stopped, even though water might drain; `io vi r ri-xn out of the pipe 53 and be drained .from the'pas- .i sage I9 through'the hole 2|, a supply of water always remains in the priming chamber vwhich is adequate to keep the pump 'IBp'rimed for a1 'l relatively longperiod of operation while pump is engagedin extracting. air-from theintaltef' travelling-upwardly, there being a priming hole in said stator at a level which divides the space between said stator and said casing into a. prim ing reservoirabove said hole and a sand trap beneathsaid hole; anda plug in said casing for cleaning said sand trap.

-' 2. A combination as in claim 1 in which a substantial area `outside said stator and adjacent said priming hole is-covered by a screen` to protect said hole from the admission of sand thereto.

3. -A combination as in claim 1 in which a' channel iscut fromthe outer surface of said. v stator in an area through which said hole 'extends; and aiine screen coveringl said channel to protect'said hole from the admission of'sand 'v thereto.

4.5,A combination as in claim 1 in which. said water-"inlet passage extends downwardlyk along- Y .side'said stator from a point located a substantial "distance above! .the level of said priming hole. 5& jAj-combination as in claim iin which saidv vvwaterin letpassage extends downwardly alongside 5 6 said inlet passage connecting with and receiving Number Name A Date through said valve the supply of water for said 1,930,403 Van der Does de Bije Oct. 10, 1933 pump. 2,212,417 George Aug. 20, 1940 JOHN B. WADE. 2,231,650 Adams Feb. 11, 1941 5 2,269,189 Downs Jan. 6, 1942 REFERENCES CITED 2,290,137 Aldridge July 14, 1942 2,329,386 Brennan Sept. 14, 1943 The following references are of record in the 2,361,146 Montenus Oct 24, 1944, le 0f this Paten# 2,428,487 Fernstrum oct. '1, 1947 UNITED STATES PATENTS 10 FOREIGN PATENTS Number Name Date 1,343,574 Miner June 15, 1920 Nmffl Ausnf MMD 1930 1,900,228 Dean Mar. '7, 1933 

